Cholesteric properties of cellulose acetate and triacetate in trifluoroacetic acid

被引：0
|
作者：
Ritcey, Anna M. [1 ]
Holme, Kevin R. [1 ]
Gray, Derek G. [1 ]
机构：
[1] McGill Univ, Canada
来源：
Macromolecules | 1988年 / 21卷 / 10期
关键词：
Acids - Cellulose Derivatives - Light - Scattering - Optical Properties - Polymers - Physical Properties;
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学科分类号：
摘要：
The optical properties of cellulose acetate and cellulose triacetate cholesteric liquid crystals in trifluoroacetic acid are investigated by circular reflectivity measurements. The reflection properties of the cellulose acetate mesophase are extremely time dependent. The observed changes are attributed to trifluoroacetylation of the unsubstituted hydroxyl groups of the polymer. Analysis of the polymer recovered from trifluoroacetic acid solution, by NMR and FT-IR spectroscopy, confirms this chemical modification. No significant decrease in molecular weight occurs on the time scale of the change in optical properties.
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页码：2914 / 1917
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